Worlds Largest Batteries ( Pumped Storage)

The vast majority of our gridscale storage of electricity uses this clever method. Electricity faces a fundamental problem that comes with pretty much any product thats provided ondemand: our ability to generate large amounts of it doesnt match up that closely with when we need it. The storage of electricity for later use, especially on a large scale, is quite challenging. Thats not to say that we dont store energy at grid scale though, and theres one type of storage that makes up the vast majority